摘要:
A turbine airfoil having an improved impact and erosion resistance. The airfoil comprises: (a) a base segment having an impact resistant leading edge section proximate to the leading edge comprising a material having having a yield strength of least about 250 ksi and an elongation percentage of about 12% or less; and (b) an erosion resistant coating overlaying the base segment at least in the leading and trailing edge portions of the pressure side, the erosion resistant coating comprising at least one ceramic layer having at least one of the following properties: (1) an erosion value of at least about 200 g. of erodent to cause a thickness loss of about 15-20 microns; (2) an erosion volume loss value (V) of about 1.9 or less as defined by the equation V=H−0.18×E0.75×F−1.65 where H is hardness, E is elastic modulus and F is fracture toughness; and (3) an F value of at least about 1.5 MPa*m1/2. The erosion resistant coating can comprise alternating ceramic and metallic layers and is typically formed by a method involving the step of forming on the pressure side of the base segment of the airfoil in alternating fashion at least one ceramic layer and at least one metallic layer.
摘要翻译:具有改善的冲击和耐冲蚀性的涡轮机翼型。 翼型件包括:(a)具有靠近前缘的抗冲击前缘部分的基部段,包括具有至少约250ksi的屈服强度和约12%或更小的伸长率的材料; 至少在所述压力侧的前缘部和后缘部分覆盖所述基部段的抗侵蚀涂层,所述耐侵蚀涂层包括至少一个具有以下特性中的至少一个的陶瓷层:(1)侵蚀 值至少约为200g。 的腐蚀导致约15-20微米的厚度损失; (2)如等式V = H -0.18的限定的约1.9或更小的侵蚀体积损失值(V)x = 0.75×F -1.65 < SUP>其中H是硬度,E是弹性模量,F是断裂韧度; 和(3)F值至少约1.5MPa * m 1/2。 抗侵蚀涂层可以包括交替的陶瓷和金属层,并且通常通过以下方法形成,该方法包括以至少一个陶瓷层和至少一个金属层交替形成在翼型的基部段的压力侧上的步骤。
摘要:
A method for applying a NiAl based bond coat and a diffusion aluminide coating to a metal substrate comprises, in part, coating a portion of the external surface of the superalloy substrate, by physical vapor deposition with a layer of a NiAl based metal alloy, wherein the deposited NiAl based metal alloy includes a controlled amount of about 6 to 25 weight percent aluminum, wherein the deposited aluminum level of the NiAl based metal alloy is controlled to be about 50-100% of its final level after aluminizing to form a coated external portion; and subsequently, simultaneously aluminizing the coated external portion and a different surface of the superalloy substrate.
摘要:
A protected article includes a substrate, and a protective structure overlying the substrate. The protective structure has a diffusion-barrier layer overlying the substrate, wherein the diffusion-barrier layer comprises at least about 70 percent by weight iridium, and a protective layer overlying the diffusion-barrier layer so that the diffusion-barrier layer is between the substrate and the protective layer. The protective layer is at least about 70 percent by weight of a platinum-group element. A ceramic thermal barrier coating may overlie the protective layer.
摘要:
A process for reducing the incidence of a secondary reaction zone (SRZ) in alloys prone to SRZ formation, particularly superalloys that have a high refractory element content. The process finds use with articles having a wall region that defines external and internal surfaces on the exterior and within the article, respectively. Diffusion coatings are formed on the internal and external surfaces of the article, with at least the diffusion coating on the external surface comprising an additive layer and a diffusion zone that is beneath the additive layer and extends into the wall region. The additive layer and at least a portion of the diffusion zone of the external diffusion coating is then removed to define an exposed surface region on the exterior of the article. An overlay coating is then deposited on the exposed surface region.
摘要:
A turbine engine component comprising a substrate made of a nickel-base or cobalt-base superalloy and a protective coating overlying the substrate, the coating formed by electroplating at least two platinum group metals selected from the group consisting of platinum, palladium, rhodium, ruthenium and iridium. The protective coating is typically heat treated to increase homogeneity of the coating and adherence with the substrate. The component typically further comprises a ceramic thermal barrier coating overlying the protective coating. Also disclosed are methods for forming the protective coating on the turbine engine component by electroplating the platinum group metals.
摘要:
Thermal barrier coating systems for use with hot section components of a gas turbine engine include an inner layer overlying a bond coated substrate and a top layer overlying at least a portion of the inner layer. The inner layer includes a thermal barrier material such as yttria-stabilized zirconia. The top layer includes a rare earth aluminate. The thicknesses and microstructures of the layers may be varied depending on the type of component to be coated. Articles incorporating the thermal barrier coating system exhibit improved resistance to CMAS infiltration.
摘要:
Methods for providing improved resistance to CMAS infiltration for hot section components of a gas turbine engine. Exemplary methods include coating a substrate with a thermal barrier coating system by overlying a bond coated substrate with an inner thermal barrier layer comprised of a thermal barrier material such as yttria-stabilized zirconia. A top layer, including a rare-earth aluminate, is deposited so as to overlie at least a portion of the inner layer. Deposition processes and coating thicknesses may be tailored to the type of component to be coated.
摘要:
The present invention discloses a passenger vehicle having a multi-position tailgate. The tailgate may be opened from a driver side or a passenger side. A retractable table for a tailgate is disclosed. The tailgate may also be opened in a third orientation, extending generally horizontally from the vehicle. A method for operating the tailgate is also disclosed.